Knurled roll



Nov. *1, 1927. 1,647,825

T. D. CAMPBELL KNURLED ROLL Original Filed Nov. :5, 1923 2 Sheets-Sheet 1 hvewto'a 225222 25.22 [km Ute]! Patented Nov. 1, 1927.

UNITED, STATES muses PATENT OFFICE.

THOMAS D. CAMPBELL, OF CLEVELAND, OHIO, ASSIGNOR TO THEOLEVELANID FOLDING -MKCHINE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

KNURLED ROLL.

; Original application filed November 3,

7 My invention relates to improvements in method of knurling and the knurled roll produced thereby;the object of my invention being the production of knurled articles that shall have lands fabricated longitudinally thereof approximately of equal height.

In the particular art to which my inven- 'tion is applied, viz, the production of knurled rolls for paper-handling mechanism, it is necessary to grind the lands as originallyknurled, while leaving a material cup or depression between adjacent lands. In the ordinary type of knurled roll the lands were unequally elevated so that it was impractical to grind morefthan one of the paired lands extending longitudinally of the rolls. However, it is apparent thatif the lands may be equally elevated, both lands of each pair separated by a cup or depression may be equally ground,'while' leaving the cup of adequate depth, if the lands aresufliciently elevated.

Accordingly, I have devised a simple and novel mode of knurling rolls or similar articles whereby the fabricated lands may be made substantially-equal inheight and sufli-' ciently elevatedabove their intervening cups toadmit of grinding both lands, whereby the use of the r011 is very materially increased. In practicing'the method of knurling these rolls hitherto, it has been thought necessary to subject the rolls to the action of the knurls advanced longitudinally thereof from end to end. invariably the lands thus fabricated are materially unequal in height, wit-lithe V disadvantage noted above.

I have discovered that by the simple expedient of twice knurling a roll or other cylindrical article, and in reverse or opposite directions, it is possible to produce lands of substantially equal elevation upon the opposite sides of longitudinal cups or depres- I sions extending lengthwise of the work or qualities are doubled.

roll, and of suflicient depth to permit the dressingor grinding of both lands without impairing the operative qualities or efficiency of the fabricated roll. Its wearing t will be desirable to explain the details of my invention in connection with theaccompanying drawings, wherein:

Figure 1 is a plan view of a lathe broken T away; at its ends, wherein my improved 1923, SerialNo. 672,690. Divided. and this application iled June 3, 1925. Serial No. 34,601.

method may advantageoeusly be practiced, v

. Fig.2 is a similar side elevation thereof, F 1g. 3 1s a transverse section on line 33, Fig. 1,

a a o 7 lug. 4: is an enlarged plan view of two coacting rolls broken away near their ends, Flg. 5 IS a transverse-section on line 5-5, Flg. 4, V

Fig. 6 is a greatly exaggerated fragmentary view in cross section of a roll knurled after the usual manner,

Fig. 7 is a similar view of a roll knurled in accordance with my invention.

Fig. 8 is another greatly exaggerated view of the latter roll with the lands dressed or ground to a common diameter.

Fig. 9 is an enlarged fragmentarydimeir sional section illustrating theinitial knurling operation, and l Fig. 10 is a similar fragmentary, dimensional section, illustrating the completed knurlingoperation, it being understood that the figures are not drawn to the scale.

Throughout the several figures of the drawings I have employed the same char-1 acter of reference to indicate similar parts.

.' Referring first to Figs. 1, 2 and 3, the

work or roll 0; is shown positioned in a lathe having the usual travelling support b actuated by the under screw 0 for effecting the travel of said support longitudinally of the.

"knurls is toward the left as indicated by the.

arrow, and the work, under high magnification, Will appear approximately as shown in Fig. 6 on a fragmentary section taken on line 6-6. Referring to the greatly enlarged section, which should be'understood to be typical of ordinary knurling, it will be seen that the right hand lands f are materially higher than are the thicker left hand lands 9, so that it is impracticable to dress or grind the latter and leave amaterial cup or depression h betweensuch-lands. Moreover,

the grinding of both lands would blunt the more elevated members of the pair, if this operation were attempted, while practically destroying the cup or depression and rendering the roll unfit for service in paper handling mechanism.

The reverse milling of the roll, after it has been completely milled longitudinally in one direction, may be accomplished either by reversing the direction of the actuating screw 0 in the lathe, or with better results ordinarily, by reversing the workend for end in the lathe and re-knurling the roll from right to left in the lathe, as before.

This reverse knurling operation serves to produce lands of substantially equal height such as shown at 2', z in the greatly enlarged fragmentary section of Fig. 7. Moreover, the longitudinal depression or cup 7L is of sufiicient depth, so that when the acute edges of the landsare dressed or ground as shown at i, 2", Fig. 8, said cup it will insure an operative working face for the roll having substantially double the wearing qualities of the rolls knurled in accordance with present methods.

In Figs. 4 and 5 the ends of two co-acting rolls a, a are shown broken away. and

in cross section, respectively, with their hardened terminal bands a, a" in bearing engagement and the operative faces of the rolls slightly separated. This latter feature necessarily is exaggerated for the purposes of illustration, since these bands are made only from .00025 to .0005 larger in diameter than are the finished or dressed rolls, in order that the knurled operative faces may handle the thinner classes of paper, such as Bible stock, in folding machines and the like.

lVhile the re-knurling in reverse direction is very simply and readily accomplished, it has never been attempted prior to my invention, so far as I am advised, yet the results are distinctly advantageous in produca better knurled article. i. e., one that is knurled u ormly throughout its operative face and is capable of being ground or dressed to a uniform diameter with respect to its lands, while preserving the intervening cup or depression. It is apparent that with duplicated ground or surfaced lands a paper-handling roll will have. twice the effective life as compared with the knurled rolls of the prior art.

As a specific example of knurling high carbon rolls for paper-handling machines, such as folding machines and the like. I may instance the initial knurling of the roll from right to left with an increase in its operative diameter of from .006 to .007". oration is diagrammatically indicated in Fig. 9 of the drawings wherein the radial increase of one-half the above figures is shown with respect to the land f upon the right.

This op one on the right, while the latter will be further elevated approximately .001" to .0015; these dimensions being indicated in the diagram of Fig. IO, of which the fragmentary section of Fig. 7 is typical. These dimensions, of course, are given merely by way of illustration in adapting my invention to the specific purpose indicated. placement and shaping eof the metal quite ob,- viously are largely under the control of the artisan and the reverse operation of knurling, preferably with closer adjustment of the knurls, alone is required for the fabrication, of rolls capable of much longer continued usethan was hitherto. possible.

Having now described the preferred method for practicing my invention and for producing the new and novel article of manufacture above described, reserved for patenting in the parent application, I claim asnew, and desire to. secure by Letters Patent, together with such modifications as. may be made by thoseordinarily skilled in the art, the following:

1. As a new article of manufacture,a knurled roll having an operative face formed of surfaced lands in paired relation, each pair interspaced by an appreciable longitudinal cup depression, substantially as set forth.

2. As a new article of manufacture, a knurled roll having surfaced lands, approximately of equal area and height spaced by appreciable cupped depressions, extending longitudinally of the roll, substantially as set forth. 7 V

3. As a new article of manufacture, a knurled roll for paper-handling mechanism having surfaced lands approximately of uniform base, height and area, spaced apart by relatively deep cupped depressions coextensive longitudinally withsaid lands, subs-tantially as set forth.

4:. As a new article of manufacture, a knurled roll having elevated. lands in paired relation approximately of equal height spaced by operative cupped depressions ex-n tending longitudinally of the roll, substantially as set forth.

5. As a new article of manufacture, a: knurled member having an operative face comprising parallel lands and intervening, cups; each pair of lands adjacent an. in.- tervening cup being surfaced to, approximately the same height, substantially as set, forth.

6. As a new article of manufacture, a roll knurled to form lands and interveningcups having a plurality of paired surfaced lands The. dis.-

fabricated along both edges of each inter- Vening cup, substantially as set forth.

7. s a new article of manufacture, a'roll for handling paper, surface-knurled to form lands and intervening fabricated depressions; said roll having the land surfaced to form a substantially continuous edge along opposing sides of such fabricated depressions, substantially asjset forth.

8. As a new article of manufacture, a l.

knurled roll having parallel surfaced lands spaced by appreciable cup depressions extending approximately its entire Working length, substantially as set forth.

In testimony whereof I do now afiix my 15 signature.

THOMAS D. CAMPBELL. 

